travis: Build Windows-specific plugins

The plugins can only be built on x64 as the MinGW headers on Ubuntu 12.04,
which we have to use for x86 due to another issue with MinGW, are too old.

scripts/test.sh

@@ -70,9 +70,15 @@ win*)
 	DEPS="gcc-mingw-w64-base"
 	case "$TEST" in
 	win64)
-		CONFIG="--host=x86_64-w64-mingw32 $CONFIG"
+		# headers on 12.04 are too old, so we only build the plugins here
+		CONFIG="--host=x86_64-w64-mingw32 $CONFIG --enable-dbghelp-backtraces
+				--enable-kernel-iph --enable-kernel-wfp --enable-winhttp"
 		DEPS="gcc-mingw-w64-x86-64 binutils-mingw-w64-x86-64 mingw-w64-x86-64-dev $DEPS"
 		CC="x86_64-w64-mingw32-gcc"
+		# apply patch to MinGW headers
+		if test -z "$1"; then
+			sudo patch -f -p 4 -d /usr/share/mingw-w64/include < src/libcharon/plugins/kernel_wfp/mingw-w64-4.8.1.diff
+		fi
 		;;
 	win32)
 		CONFIG="--host=i686-w64-mingw32 $CONFIG"